Precautions For Rotational Molding Mold Line

The closing line of the rotomolding mold is also called the parting surface and parting line of the mold, which is the contact surface of the two planes of the mold flange. When designing a mold, the appropriate selection of the mold closing line or parting surface plays an important role in the success of mold design and production. The following points must be paid attention to when designing the mold closing line:

1. The position of the mold closing line should be conducive to production operations such as mold opening and closing. Generally speaking, it is necessary to set the mold closing line at the largest size of the product. This can make the opening and closing of the mold more convenient, facilitate the rapid closing of the mold after adding materials and the rapid opening of the mold after the product is formed, and speed up the production of the product. Demolding speed improves production efficiency

2. The position of the mold closing line should take into account the aesthetic needs of the product. No matter how well the mold is made, there will still be traces of the mold closing line on the produced products. If this mark appears on the main part of the product surface, the first thing people will see when touching the product is the mark of the mold closing line, which will greatly affect the beauty and value of the product. If the mark is serious, it will directly lead to the scrapping of the product. Therefore, when designing the mold closing line, try to set it at the edge of the product where people don’t notice it much.

3. The setting of the mold closing line can make the mold structure simpler. If the mold closing line is made too complicated, the cost of the mold will increase, and the opening and closing efficiency of the mold will also be affected. Normally, the mold closing line should be set on a plane as much as possible. This can make the structure of the mold simple, which can not only reduce manufacturing costs, but also facilitate the removal of the formed product from the mold, thus improving production efficiency.

4. Sometimes due to some special reasons such as the complex shape of the product, the mold closing line can also be designed to be more complicated. For example, some parts are higher or lower than the main parting line, etc. The complex mold closing line is conducive to mold positioning and mutual cooperation. . However, the more complex the mold closing line is, the more difficult and costly it is to manufacture. In addition, try to keep the mold closing line away from oblique lines or angle changes to maintain uniform force on the mold closing line.

Sheet metal manufacturing molds generally start from the mold closing line, which is the benchmark for the entire mold manufacturing. This is the place with the highest strength of the entire mold, and it is also the place that receives the most stress, operates most frequently, and is most easily damaged during the rotational molding process. Therefore, special attention should be paid to the mold design and manufacturing process.